Bevel-square.



No. 886,639. PATENTED MAY 5, 1908.

M. RENNER.

v BEVEL SQUARE. APPLIUATION FILED s211126, 1901.

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MANFRED RENNER, OF CHICAGO, ILLINOIS.

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' BEvEL-sQUARE.

Specification of Letters Patent.

Patented May 5, 1908.

Application filed September 26, 1907. Serial No. 394,611.

To all whom it may concern:

Be it known that I, MANFRED RENNER, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Bevel-Squares, of which thefollowing is a complete specification.

This invention relates to two-bladed bevel squares, and moreparticularly to the means employed for setting and fixing the blades atany desired angle with respect to each other, and for setting the stockin a fixed relation to the blades and in a position to bisect the angletherebetween.

The object in view is to provide asimple and effective tool forfacilitating the cutting of butt and miter joints, for measuring, layingoil and bisecting either exterior or interior angles, for marking raftercuts and general use in framing work.

.Referring to the accompanying drawings- Figure l shows a plan of abevel square enibodying my invention. Fig. 2 is a similar view but withthe blades in position to measure an interior angle. Fig. 3 representsalso a plan view but with the covering plate and blades removed from thestock. F ig. 4 represents a central longitudinal section of the stock,and Fig. 5 is a detail plan of the graduated end of the lower blade.

In the drawings A designates the stock which is preferably formed of arectangular shaped casting recessed on its upper surface to providespa-ce for the device which fixes the blades to the stock. A coveringplate A1 is secured to the upper face of the stock by means of therivets l). In the stock A and covering plate A1, at the blade endsthereof, are formed the alining perforations a and al, respectively, theperforation in the stock be ing considerably, larger than that in thecover. In the perforation a fits the boss c of the thumb nut O of thebinding screw D. In the perforation al nts the sleeve E, the said sleevesurrounding the screw D and being interposed between the inner end ofthe boss c and the two bladesf andf1 on the projecting end of saidscrew. The binding screw D thus forms a pivotal aXis for the blades F,and the head d thereof, when the screw is tightened, draws the bladesdown tightly upon the end of-the sleeve. To prevent the .hwblrades beingdrawn against the cover plate A1 when the thumb nut O on the bindingscrew is tightened, the sleeve E is made to project a slight distancethrough the cover plate, when the head of said thumb nut bears againstthe stock A or in other words, the combined length of the boss c andsaid sleeve E is made a trifle greater than the thickness of the stock Aand cover A1. The effect of this will be to bind or fix the blades withrespect to each other but allow them to remain free to turn on theirpivotal axes on the stock, the screw D, the nut C and sleeve E allturning at such time in the stock. The head lend d of the screw D isprovided with the squared portion d1, which fits a'correspondingaperture in the upper blade f, thus causing the screw to turn with saidblade.

The following means are provided for fixing the blades to the stock: Theboss a0 which surrounds the aperture a, and is some what sh'orter thanthe boss c of the nut C,

lextends rearwardly, as shownA in Fig. 4, and

is vprovided at its end with the V-shaped notch a2. Laterally andinwardly projecting lugs or shoulders a3 are formed on the side walls ofthe stock A, near the top thereof and intermediate the notch a2 and thecenter of the screw D. Beneath these shoulders a3, and on top of theboss a", is laced the binding block G. This binding b ook is providedwith an aperture g1, which loosely engages the sleeve E and is adaptedto bear downwardly on the end of the boss c. The rear end of the block Ghas formed on its under side a V-shaped notch .which registers with thenotch a2 in the boss a0. A longitudi nally extending, conically headedrod II engages with its cone-shaped head h the two notches g2 and a2.This rod H is provided with a threaded portion h1 which engages `thecorrespondingly threaded lug a4 in the stock A. By turning the thumb nuth2, fixed on the end of the rod H, which projects through an aperture inthe end wall of the stock, the said rod will be advanced or retracted.Such movement of the rod, it is evident, will cause its conical head 7Lto lift or depress the rear end of the binding block G about the fulcrumformed by the shoulders a3. If the rear end of the block is pressedupwardly, its forward end will be forced downward against the inner endof the boss c, thus` pressing the ends of the blades into contact withthe cover plate A1 andholding them securely by frictional contact. Bythe construction thus described the blades are first fixed in relationto each other and then, by an independently acting device, are fixed tothe stock.

` graduations exten In order to set the blades at `any desired anglewith respect to each other, a scalelor series of graduations is formedon the pivotal end of one of the blades, with corresponding index markson the other blade.

As it is more frequently desired to lay offthe angles which correspond`with the interior or exterior angles of regular polygons, or to lay offgiven angles upon the work irrespective of their measured amount, the

little more than a blade in alinement with the index marks thereon, thecut-away portions exposing the graduation on the lower blade and thenumeial designatingtlie number of sides of the f polygon correspondingwith that particular position.

In the position indicated in Fig. 1 the index mark on the top blade fregisters with the graduation numbered 3 on the lower blade, l

which indicates that the blades are. set tol measure off the exteriorangle of a triangle; w'liile in Fig. 2 they are set to measure theinterior angle of a hexagoii. It is evident that the blades may thus beemployed to transfer established angles or lay off angles correspondingto polygons ofA any number of sides provided for. After setting to therequired angle the blades are fixed to" each A other by tightening thethumb screw C. In

transferring these angles to the work it becomes necessary to bisccttheangle between the blades. This is done. by moving the stock A aroundto a bisectingposition between the blades and then securing the bladesto the stock by advancing the threaded rod H and lifting the bindingblock G, as before explained. The bisecting position of the stock isdetermined by means of corresponding finely divided scales along theopposing edges of the blades, as shown; for instance, in the dotted lineposition of the stock-A, shown in Fig. l, the stock has been moved untilits edges register with the corresponding number, 35 in this instance,on the scale along the edges of the blades. After having been adjustedto` this position the blades are fixed to the stock as before explained.Y

pitch angle when one of the blades is made to register therewith. Thegraduations on one side of the stock, or plate, are marked --C, C, etc.,which refers to the pitch for common rafters, and the graduations on theother side are marked --H, H, etc., referring to the angle for hiprafters of the corresponding itch.

hat I claim as my invention, and desire to secure by Letters Patent, is:

l. A bevel square comprising a stock, two independently movable bladespivotally mounted thereon, two sets or series of graduations ardcorresponding index marks provided on the pivotal ends of said blades,one series for measuring external angles and one for measuring interiorangles, the said graduuations enabling the blades to be set at any anglewith respect to each other, means for fixing the blades relative to eachother, and independent means for fixing the blades to the stock,substantially as and for the purpose described. q

2. A bevel square comprising a stock provided on its upper. face withrafter-pitcli graduations with which the blades may be made to registerand thereby indicate the required angle in rafter work, one margin ofsaid face being provided with pitch graduations for common rafters, andthe other. margin thereof with pitch graduations for hip rafters, twoxindependently 'movable blades pivotally mounted thereon, said bladeshaving on their pivotal ends two seiies of graduations enabling them tobe set at any desired angle with respect to each other, a thumb screw asleeve and bolt for'fixing the blades relative to each other, and meansfor fixing the blades to said stock, substantially as and for thepurpose described. l

3. A bevel square comprising a two-piece hollow stock, a bolt extendingthrough one end of the stock, two independently movable bladesmounted onone end of said bolt, Aa thumb screw provided with an inwardlyprojecting boss engaging the other end of said bolt, a sleevesurrounding said bolt and interposed between the end of the inwardlyprojecting boss and the said blades, the length of the boss and sleevebeing slightly greater than the thickness of the stock, therebypermitting'the blades to be fixed to each v other without being xed tothe stock, graduations formed in the pivotal ends of said blades toenable them to be set at any desired angle with respect to each other,and means for fixing the blades to the stock, substantially as and forthe purpose specified.

MANFRED RENNER.

Witnesses:

J. C. WARNER, GEORGE H. SPAULDING. s

